What are the OS (Operating Systems) used on mobile phones?
Which one is more popular?

✍: FYIcenter.com

A

Currently, there are 4 major mobile Operating Systems (OS)
are used on mobile phones:

Android - Android is an open source, Linux-based and developed by Google.
Android is now the world's most widely used smartphone platform.

iOS - Developed by Apple.
With its easy-to-use interface, amazing features, and rock-solid stability, iOS is the foundation of iPhone, iPad, and iPod touch. And even as others try to catch up, the technologies and features built into iOS keep your Apple devices years ahead.

Windows Phone - Developed by Microsoft.
Windows Phone interface is more intuitive - it only shows what's essential.